//! ILI9881C MIPI DSI Display Driver
//! 
//! This module provides a driver for ILI9881C display controller.
//! ILI9881C is commonly used in 7-10 inch LCD displays with MIPI DSI interface.
//! 
//! # Typical Specifications
//! - Resolution: 800x1280 (common), but configurable
//! - Interface: MIPI DSI (4-lane)
//! - Color Format: RGB888 (24-bit)
//! - Backlight: Usually requires separate PWM control
//! 
//! # Hardware Connection
//! The display connects to RK3588 via:
//! - MIPI DSI0 or DSI1
//! - Power supply (usually 3.3V for logic, separate for backlight)
//! - Optional: Reset GPIO
//! - Optional: Backlight enable GPIO

use crate::rk3588_mipi_dsi::{
    Rk3588MipiDsi, DsiError, DisplayTiming,
};
use crate::mipi_dcs;

/// ILI9881C Display Configuration
#[derive(Debug, Clone, Copy)]
pub struct Ili9881cConfig {
    pub width: u16,
    pub height: u16,
    pub lanes: u8,
}

impl Default for Ili9881cConfig {
    fn default() -> Self {
        Self {
            width: 800,
            height: 1280,
            lanes: 4,
        }
    }
}

/// ILI9881C Display Driver
pub struct Ili9881c<'a> {
    dsi: &'a mut Rk3588MipiDsi,
    config: Ili9881cConfig,
}

impl<'a> Ili9881c<'a> {
    /// Create a new ILI9881C driver instance
    pub fn new(dsi: &'a mut Rk3588MipiDsi, config: Ili9881cConfig) -> Self {
        Self { dsi, config }
    }

    /// Initialize the display
    pub fn init(&mut self) -> Result<(), DsiError> {
        info!("Initializing ILI9881C display controller...");

        // Configure display timing
        let timing = DisplayTiming {
            width: self.config.width,
            height: self.config.height,
            hsa: 20,
            hbp: 20,
            hfp: 40,
            vsa: 4,
            vbp: 12,
            vfp: 20,
        };

        // Initialize DSI controller
        self.dsi.init(&timing)?;

        // Enter command mode for initialization
        self.dsi.enter_command_mode();

        // Delay after power on
        self.delay_ms(120);

        // Send initialization sequence
        self.send_init_sequence()?;

        info!("ILI9881C initialization sequence completed");

        // Exit sleep mode
        mipi_dcs::sleep_out(self.dsi)?;
        self.delay_ms(120);

        // Set pixel format to 24-bit RGB
        mipi_dcs::set_pixel_format(self.dsi, mipi_dcs::pixel_format::PIXEL_FORMAT_24BPP)?;

        // Set address mode (no flip, RGB order)
        mipi_dcs::set_address_mode(self.dsi, 0x00)?;

        // Display on
        mipi_dcs::display_on(self.dsi)?;
        self.delay_ms(50);

        // Switch to video mode for continuous display
        self.dsi.enter_video_mode();

        info!("ILI9881C display ready");

        Ok(())
    }

    /// Send ILI9881C specific initialization sequence
    fn send_init_sequence(&mut self) -> Result<(), DsiError> {
        // This is a typical initialization sequence for ILI9881C
        // Note: Actual sequence may vary depending on the specific panel

        // Page 3 Command
        self.send_cmd(0xFF, &[0x98, 0x81, 0x03])?;
        
        // GIP_1
        self.send_cmd(0x01, &[0x00])?;
        self.send_cmd(0x02, &[0x00])?;
        self.send_cmd(0x03, &[0x53])?;
        self.send_cmd(0x04, &[0x53])?;
        self.send_cmd(0x05, &[0x13])?;
        self.send_cmd(0x06, &[0x04])?;
        self.send_cmd(0x07, &[0x02])?;
        self.send_cmd(0x08, &[0x02])?;
        self.send_cmd(0x09, &[0x00])?;
        self.send_cmd(0x0A, &[0x00])?;
        self.send_cmd(0x0B, &[0x00])?;
        self.send_cmd(0x0C, &[0x00])?;
        self.send_cmd(0x0D, &[0x00])?;
        self.send_cmd(0x0E, &[0x00])?;
        self.send_cmd(0x0F, &[0x00])?;
        
        self.send_cmd(0x10, &[0x00])?;
        self.send_cmd(0x11, &[0x00])?;
        self.send_cmd(0x12, &[0x00])?;
        self.send_cmd(0x13, &[0x00])?;
        self.send_cmd(0x14, &[0x00])?;
        self.send_cmd(0x15, &[0x00])?;
        self.send_cmd(0x16, &[0x00])?;
        self.send_cmd(0x17, &[0x00])?;
        self.send_cmd(0x18, &[0x00])?;
        self.send_cmd(0x19, &[0x00])?;
        self.send_cmd(0x1A, &[0x00])?;
        self.send_cmd(0x1B, &[0x00])?;
        self.send_cmd(0x1C, &[0x00])?;
        self.send_cmd(0x1D, &[0x00])?;
        self.send_cmd(0x1E, &[0xC0])?;
        self.send_cmd(0x1F, &[0x80])?;
        
        self.send_cmd(0x20, &[0x02])?;
        self.send_cmd(0x21, &[0x09])?;
        self.send_cmd(0x22, &[0x00])?;
        self.send_cmd(0x23, &[0x00])?;
        self.send_cmd(0x24, &[0x00])?;
        self.send_cmd(0x25, &[0x00])?;
        self.send_cmd(0x26, &[0x00])?;
        self.send_cmd(0x27, &[0x00])?;
        self.send_cmd(0x28, &[0x55])?;
        self.send_cmd(0x29, &[0x03])?;
        self.send_cmd(0x2A, &[0x00])?;
        self.send_cmd(0x2B, &[0x00])?;
        self.send_cmd(0x2C, &[0x00])?;
        self.send_cmd(0x2D, &[0x00])?;
        self.send_cmd(0x2E, &[0x00])?;
        self.send_cmd(0x2F, &[0x00])?;
        
        self.send_cmd(0x30, &[0x00])?;
        self.send_cmd(0x31, &[0x00])?;
        self.send_cmd(0x32, &[0x00])?;
        self.send_cmd(0x33, &[0x00])?;
        self.send_cmd(0x34, &[0x00])?;
        self.send_cmd(0x35, &[0x00])?;
        self.send_cmd(0x36, &[0x00])?;
        self.send_cmd(0x37, &[0x00])?;
        self.send_cmd(0x38, &[0x3C])?;
        self.send_cmd(0x39, &[0x00])?;
        self.send_cmd(0x3A, &[0x00])?;
        self.send_cmd(0x3B, &[0x00])?;
        self.send_cmd(0x3C, &[0x00])?;
        self.send_cmd(0x3D, &[0x00])?;
        self.send_cmd(0x3E, &[0x00])?;
        self.send_cmd(0x3F, &[0x00])?;
        
        self.send_cmd(0x40, &[0x00])?;
        self.send_cmd(0x41, &[0x00])?;
        self.send_cmd(0x42, &[0x00])?;
        self.send_cmd(0x43, &[0x00])?;
        self.send_cmd(0x44, &[0x00])?;
        
        // GIP_2
        self.send_cmd(0x50, &[0x01])?;
        self.send_cmd(0x51, &[0x23])?;
        self.send_cmd(0x52, &[0x45])?;
        self.send_cmd(0x53, &[0x67])?;
        self.send_cmd(0x54, &[0x89])?;
        self.send_cmd(0x55, &[0xAB])?;
        self.send_cmd(0x56, &[0x01])?;
        self.send_cmd(0x57, &[0x23])?;
        self.send_cmd(0x58, &[0x45])?;
        self.send_cmd(0x59, &[0x67])?;
        self.send_cmd(0x5A, &[0x89])?;
        self.send_cmd(0x5B, &[0xAB])?;
        self.send_cmd(0x5C, &[0xCD])?;
        self.send_cmd(0x5D, &[0xEF])?;
        
        // GIP_3
        self.send_cmd(0x5E, &[0x01])?;
        self.send_cmd(0x5F, &[0x08])?;
        self.send_cmd(0x60, &[0x02])?;
        self.send_cmd(0x61, &[0x02])?;
        self.send_cmd(0x62, &[0x0A])?;
        self.send_cmd(0x63, &[0x15])?;
        self.send_cmd(0x64, &[0x14])?;
        self.send_cmd(0x65, &[0x02])?;
        self.send_cmd(0x66, &[0x11])?;
        self.send_cmd(0x67, &[0x10])?;
        self.send_cmd(0x68, &[0x02])?;
        self.send_cmd(0x69, &[0x0F])?;
        self.send_cmd(0x6A, &[0x0E])?;
        self.send_cmd(0x6B, &[0x02])?;
        self.send_cmd(0x6C, &[0x0D])?;
        self.send_cmd(0x6D, &[0x0C])?;
        self.send_cmd(0x6E, &[0x06])?;
        self.send_cmd(0x6F, &[0x02])?;
        self.send_cmd(0x70, &[0x02])?;
        self.send_cmd(0x71, &[0x02])?;
        self.send_cmd(0x72, &[0x02])?;
        self.send_cmd(0x73, &[0x02])?;
        self.send_cmd(0x74, &[0x02])?;
        
        self.send_cmd(0x75, &[0x06])?;
        self.send_cmd(0x76, &[0x02])?;
        self.send_cmd(0x77, &[0x02])?;
        self.send_cmd(0x78, &[0x0A])?;
        self.send_cmd(0x79, &[0x15])?;
        self.send_cmd(0x7A, &[0x14])?;
        self.send_cmd(0x7B, &[0x02])?;
        self.send_cmd(0x7C, &[0x10])?;
        self.send_cmd(0x7D, &[0x11])?;
        self.send_cmd(0x7E, &[0x02])?;
        self.send_cmd(0x7F, &[0x0C])?;
        self.send_cmd(0x80, &[0x0D])?;
        self.send_cmd(0x81, &[0x02])?;
        self.send_cmd(0x82, &[0x0E])?;
        self.send_cmd(0x83, &[0x0F])?;
        self.send_cmd(0x84, &[0x08])?;
        self.send_cmd(0x85, &[0x02])?;
        self.send_cmd(0x86, &[0x02])?;
        self.send_cmd(0x87, &[0x02])?;
        self.send_cmd(0x88, &[0x02])?;
        self.send_cmd(0x89, &[0x02])?;
        self.send_cmd(0x8A, &[0x02])?;

        // Page 4 Command
        self.send_cmd(0xFF, &[0x98, 0x81, 0x04])?;
        self.send_cmd(0x6C, &[0x15])?;
        self.send_cmd(0x6E, &[0x30])?;
        self.send_cmd(0x6F, &[0x33])?;
        self.send_cmd(0x3A, &[0xA4])?;
        self.send_cmd(0x8D, &[0x1F])?;
        self.send_cmd(0x87, &[0xBA])?;
        self.send_cmd(0x26, &[0x76])?;
        self.send_cmd(0xB2, &[0xD1])?;

        // Page 1 Command
        self.send_cmd(0xFF, &[0x98, 0x81, 0x01])?;
        self.send_cmd(0x22, &[0x0A])?;
        self.send_cmd(0x31, &[0x00])?;
        self.send_cmd(0x53, &[0x7C])?;
        self.send_cmd(0x55, &[0x86])?;
        self.send_cmd(0x50, &[0xC0])?;
        self.send_cmd(0x51, &[0xC0])?;
        self.send_cmd(0x60, &[0x28])?;

        // Gamma Setting
        self.send_cmd(0xA0, &[0x08])?;
        self.send_cmd(0xA1, &[0x1A])?;
        self.send_cmd(0xA2, &[0x27])?;
        self.send_cmd(0xA3, &[0x15])?;
        self.send_cmd(0xA4, &[0x17])?;
        self.send_cmd(0xA5, &[0x2A])?;
        self.send_cmd(0xA6, &[0x1E])?;
        self.send_cmd(0xA7, &[0x1F])?;
        self.send_cmd(0xA8, &[0x8B])?;
        self.send_cmd(0xA9, &[0x1B])?;
        self.send_cmd(0xAA, &[0x27])?;
        self.send_cmd(0xAB, &[0x78])?;
        self.send_cmd(0xAC, &[0x18])?;
        self.send_cmd(0xAD, &[0x18])?;
        self.send_cmd(0xAE, &[0x4C])?;
        self.send_cmd(0xAF, &[0x21])?;
        self.send_cmd(0xB0, &[0x27])?;
        self.send_cmd(0xB1, &[0x54])?;
        self.send_cmd(0xB2, &[0x67])?;
        self.send_cmd(0xB3, &[0x39])?;

        self.send_cmd(0xC0, &[0x08])?;
        self.send_cmd(0xC1, &[0x1A])?;
        self.send_cmd(0xC2, &[0x27])?;
        self.send_cmd(0xC3, &[0x15])?;
        self.send_cmd(0xC4, &[0x17])?;
        self.send_cmd(0xC5, &[0x2A])?;
        self.send_cmd(0xC6, &[0x1E])?;
        self.send_cmd(0xC7, &[0x1F])?;
        self.send_cmd(0xC8, &[0x8B])?;
        self.send_cmd(0xC9, &[0x1B])?;
        self.send_cmd(0xCA, &[0x27])?;
        self.send_cmd(0xCB, &[0x78])?;
        self.send_cmd(0xCC, &[0x18])?;
        self.send_cmd(0xCD, &[0x18])?;
        self.send_cmd(0xCE, &[0x4C])?;
        self.send_cmd(0xCF, &[0x21])?;
        self.send_cmd(0xD0, &[0x27])?;
        self.send_cmd(0xD1, &[0x54])?;
        self.send_cmd(0xD2, &[0x67])?;
        self.send_cmd(0xD3, &[0x39])?;

        // Page 0 Command
        self.send_cmd(0xFF, &[0x98, 0x81, 0x00])?;

        Ok(())
    }

    /// Send a command with parameters
    fn send_cmd(&mut self, cmd: u8, params: &[u8]) -> Result<(), DsiError> {
        mipi_dcs::dcs_write_n(self.dsi, cmd, params)
    }

    /// Turn display on
    pub fn display_on(&mut self) -> Result<(), DsiError> {
        mipi_dcs::display_on(self.dsi)
    }

    /// Turn display off
    pub fn display_off(&mut self) -> Result<(), DsiError> {
        mipi_dcs::display_off(self.dsi)
    }

    /// Enter sleep mode
    pub fn sleep(&mut self) -> Result<(), DsiError> {
        mipi_dcs::sleep_in(self.dsi)?;
        self.delay_ms(120);
        Ok(())
    }

    /// Exit sleep mode
    pub fn wake(&mut self) -> Result<(), DsiError> {
        mipi_dcs::sleep_out(self.dsi)?;
        self.delay_ms(120);
        Ok(())
    }

    /// Simple delay function (using busy wait)
    /// Note: This is a rough approximation and should be replaced
    /// with a proper timer-based delay in production code
    fn delay_ms(&self, ms: u32) {
        // Approximate delay using busy loop
        // Assuming ~1GHz CPU, roughly 1000000 iterations per ms
        let cycles = ms * 1_000_000;
        for _ in 0..cycles {
            core::hint::spin_loop();
        }
    }

    /// Fill screen with a solid color (RGB888)
    pub fn fill_color(&mut self, color: u32) -> Result<(), DsiError> {
        // Set column address (0 to width-1)
        mipi_dcs::set_column_address(self.dsi, 0, self.config.width - 1)?;
        
        // Set page address (0 to height-1)
        mipi_dcs::set_page_address(self.dsi, 0, self.config.height - 1)?;
        
        // Start memory write
        mipi_dcs::dcs_write_0(self.dsi, mipi_dcs::dcs_cmd::WRITE_MEMORY_START)?;
        
        // Note: Actual pixel data would need to be sent here
        // This is a simplified version - actual implementation would require
        // framebuffer support and DMA for efficient data transfer
        
        info!("Fill color command sent (color: 0x{:06X})", color);
        
        Ok(())
    }

    /// Get display width
    pub fn width(&self) -> u16 {
        self.config.width
    }

    /// Get display height
    pub fn height(&self) -> u16 {
        self.config.height
    }
}

